海湾战争与美国E-3预警机

海湾战争中,美国E-3预警机战功显赫。本文详述E-3预警机研制过程,基本规格,目前生产型号,航空电子装备,以及未来的技术改造。

Two-Photon Exchange Corrections to Single Spin Asymmetry of Neutron and 3He

In a simple hadronie model, the two-photon exchange contributions to the single spin asymmetries for the nucleon and the 3He are estimated. The results show that the elastic contributions of two-photon exchange to the single spin asymmetries for the nucleon are rather small while those for the 3He are relatively large. Besides the strong angular dependence, the two-photon contributions to the single transfer. spin asymmetry for the 3He are very sensitive to the momentum

现代战争的新宠预警指挥机

"A-50":俄罗斯主力预警机 1965年,前苏联在"伊尔-76"军用运输机机身后上方竖起了一个大的天线园盘、机内装上具有下视能力的脉冲多普勒预警雷达以及敌我识别电子系统,这就是最早的"A-50"预警机。1984年,它开始投入部队使用。飞机飞行在11000米的高空,时速760千米,持续巡航4小时。